Book Image

Pandas Cookbook

By : Theodore Petrou
Book Image

Pandas Cookbook

By: Theodore Petrou

Overview of this book

This book will provide you with unique, idiomatic, and fun recipes for both fundamental and advanced data manipulation tasks with pandas 0.20. Some recipes focus on achieving a deeper understanding of basic principles, or comparing and contrasting two similar operations. Other recipes will dive deep into a particular dataset, uncovering new and unexpected insights along the way. The pandas library is massive, and it's common for frequent users to be unaware of many of its more impressive features. The official pandas documentation, while thorough, does not contain many useful examples of how to piece together multiple commands like one would do during an actual analysis. This book guides you, as if you were looking over the shoulder of an expert, through practical situations that you are highly likely to encounter. Many advanced recipes combine several different features across the pandas 0.20 library to generate results.
Table of Contents (12 chapters)

Examining the groupby object

The immediate result from using the groupby method on a DataFrame will be a groupby object. Usually, we continue operating on this object to do aggregations or transformations without ever saving it to a variable. One of the primary purposes of examining this groupby object is to inspect individual groups.

Getting ready

In this recipe, we examine the groupby object itself by directly calling methods on it as well as iterating through each of its groups.

How to do it...

  1. Let's get started by grouping the state and religious affiliation...